Study On Support Technology Of Roadway In Hard Rock At Depth

The hard rock in deep is in an environment with three "high"—high ground stress,high earth temperature,high mining depth. It's mechanical behavior acts differently from shallow area.The frequency of the rockburst increase as the mining depth increase. Because of the dynamic characteristic of rockburst, most of the classic theory,methods,and technology are partly or entirely invalid. So,it is very important to study the hard rock support technology in deep engineering.Based on "Strata Control Technology of Dongguashan drift",The paper has done a study about several aspects as follow:(1)Theory and technology about the support of tunnel at home and abroad are studied.(2)Roadway support principle has the rock burst prone is analyzed from the view of static point (rock reinforcement),energy point, and momentum point.And summarized the basic principles and the optimization method of roadway which has a tendency to rock burst(3)Through the numerical Simulation to rock burst prone roadway, following conclusions are getted to:a. For a relatively low rock strength tunnel,we can improve the rock state to reduce the possibility of rock burst for use of supporting.b.For a relatively high rock strength tunnel,supporting has little effect in improving the surrounding rock stress and lowering the tendency of rock burst. Supporting is major to eliminate or minimize damaging roadway when rock burst.Copper Dongguashan geological conditions, stress conditions were analyzed.And high ground stress that may cause problems of rock burst in mining are analyzed and preference studied.(4) The uniform design is introduced in concrete mixing proportion design. The effects of the factors on shot concrete mixing proportion design are found, and the the advantage of uniform design in shot concrete mixing proportion design is proved.(5)The paper takes a numerical simulation analysis of three kinds of roadway in condition of the major rock of Dongguashan, in using of midas simulation software. Analysis of tunnel support structure for the role of rock burst, and Dongguashan roadway optimization tips are proposed.